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		<P><FONT color=green size=5>modify_variable </FONT></P>
		<P>Modify&nbsp;the value of one of the logic variables</P>
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		<P>
		Each group come with a set of 4 variables with id 0 to 3.<BR>
		Variables are floating point value.
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		<P>
		Each group come with a set of 4 variables with id 0 to 3.<BR>
		</P>
		<P>
		Locals variables are the variables of the current group, they are expressed with a 'v' followed by
		the variable id (0-3). eg : v0. <br>
		NB: foreign variables are accessible only if the group name is unique in the manager or in the world.
		</P>
		<P>Foreigns variables are variables that come from another group. They are expressed with the group name
		followed by a colon ':' then followed by a local variable identifier (v<id>). eg : group_1:v2.<br>
		</P>
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		Constant value are floating point numerical expression in base 10.
		</P>
		<P><STRONG>Patrameters:</STRONG></P>
		<P>&lt;local_variable | foreign_variable&gt; &lt; = | + | - | * | / &gt; &lt;local_variable | foreign_variable | constant_value&gt;</P>
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